Add to en_us.json

  "block.tutorialmod.firestone_block": "Firestone Block",

Add to ModBlocks.java

    public static final RegistryObject<Block> FIRESTONE_BLOCK = registerBlock("firestone_block",
            () -> new FirestoneBlock(AbstractBlock.Properties.create(Material.IRON)
                    .harvestLevel(2).setRequiresTool().harvestTool(ToolType.PICKAXE).hardnessAndResistance(6f)));

blockmodel-firestone_block.json

{
  "parent": "block/cube_all",
  "textures": {
    "all": "tutorialmod:block/firestone_block"
  }
}

blockstates-firestone_block.json

{
  "variants": {
    "": { "model": "tutorialmod:block/firestone_block" }
  }
}

FirestoneBlock.java

public class FirestoneBlock extends Block {
    public FirestoneBlock(Properties properties) {
        super(properties);
    }

    @SuppressWarnings("deprecation")
    @Override
    public ActionResultType onBlockActivated(BlockState state, World worldIn, BlockPos pos, PlayerEntity player,
                                             Hand handIn, BlockRayTraceResult hit) {
        if(!worldIn.isRemote()) {
            if(handIn == Hand.MAIN_HAND) {
                System.out.println("I right-clicked a FirestoneBlock. Called for the Main Hand!");
            }
            if(handIn == Hand.OFF_HAND) {
                System.out.println("I right-clicked a FirestoneBlock. Called for the Off Hand!");
            }
        }
        return super.onBlockActivated(state, worldIn, pos, player, handIn, hit);
    }

    @SuppressWarnings("deprecation")
    @Override
    public void onBlockClicked(BlockState state, World worldIn, BlockPos pos, PlayerEntity player) {
        if(!worldIn.isRemote()) {
            System.out.println("I left-clicked a FirestoneBlock");
        }
    }

    @Override
    public void onEntityWalk(World worldIn, BlockPos pos, Entity entityIn) {
        Firestone.lightEntityOnFire(entityIn, 5);
        super.onEntityWalk(worldIn, pos, entityIn);
    }
}

itemmodel-firestone_block.json

{
  "parent": "tutorialmod:block/firestone_block"
}